Question

javascript 这样传参正确吗？

function mouseover (val1,val2)

{

val1.style.visibility="hidden"
val2.style.visibility="visible"
}
<input id="box" class="container1" type="checkbox" name="box" style="z-index:1;"onMouseOut="mouseover(this,pic);"> <img name="pic" id="pic" class="container2" src="xin.jpg" style="z-index:2; " onMouseOver="mouseover(this,box);">
我调试时系统提示“缺少对象”

Answer 1

把this改成相对应的id!
<script>
function mouseover (val1,val2)

{

val1.style.visibility="hidden"
val2.style.visibility="visible"
} </script>
<input id="box" class="container1" type="checkbox" name="box" style="z-index:1;"onMouseOut="mouseover(box,pic);"> <img name="pic" id="pic" class="container2" src="xin.jpg" style="z-index:2; " onMouseOver="mouseover(pic,box);">